| Title: | DOUBLE-TAG EVENTS IN TWO-PHOTON COLLISIONS AT L3 EXPERIMENT |
| DOI No: | 10.1142/9789812777157_0033 |
| Source: | PHOTON 2001 (pp 170-173)
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| Author(s): | C. H. LIN
Department of Physics, National Central University, Chung-Li, Taiwan
FOR THE L3 COLLABORATION |
| Abstract: | Double-tag events in two-photon collisions are studied using the L3 detector at LEP with centre-of-mass energies from  to  . The cross-sections of e+e- → e+e- hadrons and γ* γ* → hadrons are given as a function of the photon virtualities,  and  , of the two-photon mass, Wγγ, and of the variable  for an average photon virtuality 〈Q2〉 = 16 GeV2. The results are in agreement with NLO calculations for the QPM process in the interval 2 ≤ Y ≤ 5. An excess is observed in the interval 5 ≤ Y ≤ 7, corresponding to Wγγ greater than 40 GeV. The PHOJET Monte Carlo describes the data reasonably well. |
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